water purifiers for household use; filtration apparatus for water purifiers for household use; cartridge filters for water purifiers for household use; filters for water purifiers for household use; filter cartridges for water purifiers.

Kim D.H.,Chonnam National University | Kim B.H.,Chonnam National University | Yang K.S.,Chonnam National University | Kang K.C.,Microfilter Co. | And 2 more authors.Journal of the Korean Chemical Society | Year: 2011

The effect of modification of granular activated carbon on Pb(II) adsorption is described. Activated carbons (AC) have been proven to be effective adsorbents for the removal of a wide variety of organic and inorganic pollutants. ACs are widely used to treat waters contaminated with heavy metals because of their well developed porous structures, large surface area and a wide spectrum of surface functional. The surface chemistry of ACs has a major influence on their capacity to adsorb inorganic compounds, especially metallic cations. The decrease of surface area was mainly ascribed to the decrease of the micropore volume. Meanwhile, the specific surface areas or micropore volumes were slightly decreased after the chemical treatment due to the micropore filling or blocking. Nevertheless, the total Pb(II) adsorption of modified GACs was increased with increasing of the NaOH concentration, attributed to the good interaction between Pb(II) ions and polar functional groups on the GACs.
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As the need for miniaturization in water purification filter increases, the development of filter media for single filtration with multiple function was strongly required. In this study, the molded activated carbon composed of single unit was manufactured by extrusion-sintering process, and then the flow rate, density and porosity were investigated using the molded activated carbon manufactured at various extrusion temperature. We confirmed that it was possible to manufacture the single unit-molded activated carbon when the extrusion temperature was 140∼230 oC more than 133 oC being of polymer binder melting point, and the optimal extrusion temperature for the molded activated carbon with maximum flow rate was 170 oC since the molded activated carbon had low density and high through porosity. Also we confirmed that the flow rate through the molded activated carbon was strongly dependent upon through pore porosity compared to total porosity for the molded activated carbon.
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Kim D.H.,Chonnam National University | Kim D.W.,Chonnam National University | Kim B.-H.,Chonnam National University | Yang K.S.,Chonnam National University | And 2 more authors.Journal of the Korean Chemical Society | Year: 2013

The adsorption characteristics of Cd(II) and Pb(II) in aqueous solution using granular activated carbon (GAC), activated carbon fiber (ACF), modified ACF (NaACF), and a mixture of GAC and NaACF (GAC/NaACF) have been studied. The surface properties, such as morphology, surface functional groups, and composition of various adsorbents were determined using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) measurements. The specific surface area, total pore volume, and pore size distribution were investigated using nitrogen adsorption, Brunauer-Emmett-Teller (BET), and Barrett-Joyner-Halenda (BJH) methods. In this study, NaACF showed a high adsorption capacity and rate for heavy metal ions due to the improvement of its ion-exchange capabilities by additional oxygen functional groups. Moreover, the GAC and NaACF mixture was used as an adsorbent to determine the adsorbent-adsorbate interaction in the presence of two competitive adsorbents.
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